Tianjun/update docs

[codecov[bot]]

Codecov Report

Patch coverage: 34.78% and project coverage change: -0.06 :warning:

Comparison is base (2ae5f18) 68.88% compared to head (2c39ea1) 68.82%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #76 +/- ## ========================================== - Coverage 68.88% 68.82% -0.06% ========================================== Files 50 50 Lines 1382 1389 +7 ========================================== + Hits 952 956 +4 - Misses 430 433 +3 ``` | [Impacted Files](https://codecov.io/gh/oolong-dev/OpenTelemetry.jl/pull/76?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=oolong-dev) | Coverage Δ | | |---|---|---| | [src/api/src/trace/tracer\_provider.jl](https://codecov.io/gh/oolong-dev/OpenTelemetry.jl/pull/76?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=oolong-dev#diff-c3JjL2FwaS9zcmMvdHJhY2UvdHJhY2VyX3Byb3ZpZGVyLmps) | `75.64% <ø> (ø)` | | | [...oto/http/src/OpenTelemetryExporterOtlpProtoHttp.jl](https://codecov.io/gh/oolong-dev/OpenTelemetry.jl/pull/76?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=oolong-dev#diff-c3JjL2V4cG9ydGVyL290bHAvcHJvdG8vaHR0cC9zcmMvT3BlblRlbGVtZXRyeUV4cG9ydGVyT3RscFByb3RvSHR0cC5qbA==) | `5.26% <0.00%> (-0.62%)` | :arrow_down: | | [src/sdk/src/exporter.jl](https://codecov.io/gh/oolong-dev/OpenTelemetry.jl/pull/76?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=oolong-dev#diff-c3JjL3Nkay9zcmMvZXhwb3J0ZXIuamw=) | `95.23% <0.00%> (-2.33%)` | :arrow_down: | | [src/sdk/src/trace/span\_processor.jl](https://codecov.io/gh/oolong-dev/OpenTelemetry.jl/pull/76?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=oolong-dev#diff-c3JjL3Nkay9zcmMvdHJhY2Uvc3Bhbl9wcm9jZXNzb3Iuamw=) | `44.18% <0.00%> (ø)` | | | [src/sdk/src/trace/trace\_provider.jl](https://codecov.io/gh/oolong-dev/OpenTelemetry.jl/pull/76?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=oolong-dev#diff-c3JjL3Nkay9zcmMvdHJhY2UvdHJhY2VfcHJvdmlkZXIuamw=) | `87.50% <ø> (ø)` | | | [src/api/src/trace/tracer\_basic.jl](https://codecov.io/gh/oolong-dev/OpenTelemetry.jl/pull/76?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=oolong-dev#diff-c3JjL2FwaS9zcmMvdHJhY2UvdHJhY2VyX2Jhc2ljLmps) | `89.58% <100.00%> (ø)` | | | [src/exporter/otlp/proto/http/src/convert.jl](https://codecov.io/gh/oolong-dev/OpenTelemetry.jl/pull/76?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=oolong-dev#diff-c3JjL2V4cG9ydGVyL290bHAvcHJvdG8vaHR0cC9zcmMvY29udmVydC5qbA==) | `72.72% <100.00%> (+1.89%)` | :arrow_up: | | [src/sdk/src/trace/span.jl](https://codecov.io/gh/oolong-dev/OpenTelemetry.jl/pull/76?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=oolong-dev#diff-c3JjL3Nkay9zcmMvdHJhY2Uvc3Bhbi5qbA==) | `82.43% <100.00%> (-0.24%)` | :arrow_down: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=oolong-dev). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=oolong-dev)

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Do you have feedback about the report comment? Let us know in this issue.